Question: What are the disjoint union and opposite of Real numbers?
Paraphrase: What are the opposite of real numbers as well as the disjoint union?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q12916 wdt:P2738 ?ans_1 . wd:Q12916 wdt:P461 ?ans_2 }
Answer: list values as qualifiers, complex number, list values as qualifiers, imaginary number